At 4:03 PM -0400 4/29/2010, iJohn wrote:
On Thu, Apr 29, 2010 at 12:09 AM, Dan <dantear...@gmail.com> wrote:
dd if=/dev/zero bs=1024 count=1048576 of=/Volumes/MyUSBstick/gigabyte.file
I went with Dan's method ... it just seemed easier. Can't say why though. ;-)
For my 2008 white MacBook 500GB Hitatchi hard drive:
write: 37.7 MiB/sec
read: 41.9 MiB/sec
For my USB attached 16GB "Diesel" flash drive:
write: 14.3 MiB/sec
read: 34.7 MiB/sec
FWIW both are formatted as HFS+.
I'm sort of surprised that my MB's hard drive isn't a little faster
This method mostly defeats caching - especially the big buffers on
the HDs. So it's a fairly pure way of seeing bus and mechanism
performance. IN the real world, where you're moving smaller pieces
of data and intermixing reads and writes, the system (memory cache,
bus, drive cache, and mechanism) will perform better overall.
- Dan.
--
- Psychoceramic Emeritus; South Jersey, USA, Earth.
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